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D and F Block Elements question

2015 · Q88
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D and F Block Elements question

2015 · Q88

NEETChemistryD and F Block ElementsMCQ+4 / −1
Magnetic moment 2.84 B.M. is given by (At. nos. Ni = 28, Ti = 22, Cr = 24, Co = 27)
  1. A
    Cr2+
  2. B
    Co2+
  3. C
    Ni2+
  4. D
    Ti3+
View written solutionFree

Correct answer: C

Magnetic moment (μ\mu μ) = n(n+2)\sqrt {n\left( {n + 2} \right)} n(n+2)​

For μ\mu μ = 2.84

2.84 = n(n+2)\sqrt {n\left( {n + 2} \right)} n(n+2)​

⇒\Rightarrow⇒ n = 2

Cr2+ – [Ar]3d44s0 , 4 unpaired electrons

Co2+ – [Ar]3d74s0 , 3 unpaired electrons

Ni2+ – [Ar]3d8 4s0 , 2 unpaired electrons

Ti3+ – [Ar]3d14s0 , 1 unpaired electron

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